Tool.



J. L. HOFFMAN.

TOOL.

APPLICATION FILED MAY 1, 1912.

1,088,990 Patented Mar. 3, 1914.

WITNESSES Attorney JAMES L. HOFFMAN, OF PLEASANT LAKE, INDIANA,

TOOL.

. Specification of Letters Patent.

Application filed May 1, 1912.

Patented Mar. 3, 1914.. Serial No. 694,460.

To all whom it may concern Be it known that I, JAMES L. HOFFMA a citizen of the United States, residing at Pleasant Lake, in the county of Steuben and State of Indiana, have invented certain new and useful Improvements in Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to new and useful-improvements in tools, and the object of my invention is to provide a bearing and an operating sleeve for tools.

Other objects and advantages will be hereinafter made clearly apparent in the specification and pointed out in the claim.

In the accompanying drawings I have shown the preferred form which my invention may take.

In said drawings, the figure shows a longitudinal sectional View through my improved form of devices as applied to use.

Referring to the drawing 3 is a shaft, which is provided at one end with a flange 4, said flange being preferably hexagonal in shape whereby the same may be easily gripped and held by means of a wrench. The portion of the shaft adjacent said flange 4 is screw threaded, for a purpose hereinafter made clearly apparent. The opposite end of the shaft 3 is provided with a transverse aperture 5 therethrough adapted to receive the hooked end of the chain 6, which is connected to any preferred source of power. The chain 6 is contained in a flexible tubing 7 of the usual or any preferred construction. The end of said tubing is provided with a metallic sleeve 8, which is internally tapered, as shown at 9.

In order that the shaft 3 may be properly rotated by means of the chain 6, I employ a bearing sleeve 10 for said shaft, said sleeve being adapted to receive the shaft therethrough. The shaft 3 has secured thereto a grinding wheel 11, which is placed upon said shaft and is clamped against the flange 4 by means of a nut 12, which is tightened upon the screw threaded portion of said shaft. The shaft 3 is 'then extended through the sleeve 10, the end of the bore of said sleeve adjacent the nut 12 being preferably enlarged to accommodate the threaded portion of said shaft without causing un--' due friction when a grinding wheel of comparativelysmall width is employed.

In order that the shaft 3 may be prevented from casual displacement from the sleeve 10, I employ a headless screw 13, which is threaded through the sleeve 10 and is adapt- "d to have its inner end extend intoa groove 14 formed in said shaft. The sleeve 10 is tapered similarly to the sleeve 8 and is adapted to extend therein. When the wheel is in operation the operating chain 6 will tend to shorten and will cause the sleeve 10 to bind on the sleeve 8 so as to prevent the casual separation of said sleeves. When employing this form of sleeve it is also necessary to employ a shaft 3 of a little longer length than that shown in figure. The sleeve 10 is provided with flanges 15, which are separated a distance approximately .equal to the width of the operators hand and act as guards to prevent the hand from slipping against the grinding wheel or from being endangered by flying particles from said wheel. This construction is particularly advantageous as the operators hand is prevented from being injured by the end of the operating chain.

While I have shown the preferred forms of my invention I desire it to be understood that various modifications may be made therein without departing from the spirit and scope of my invention.

What I claim as new is:

In combination, a non-rotatable flexible tube, an interiorly tapered sleeve fixed in one end thereof, a bearing sleeve having one end exteriorly tapered and disposed in the tapered end of said first mentioned sleeve, a shaft rotatable in said bearing sleeve, means to prevent longitudinal movement of said shaft within said sleeve, a grinding wheel secured to one end of said shaft, and a chain disposed within said tubing for driving said shaft and adapted when rotated to contract and frictionally lock said bearing sleeve with said first mentioned sleeve and tubing.

In testimony whereof name to this specification two subscribing witnesses.

JAMES L. HOFFMAN.

Witnesses:

GEO. W. Gnmnnr, CARL -E. TU'I'ILE.

in the presence of I have signed my 

